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Mochi (Japanese: 餅, もち) is Japanese rice cake made of mochigome, a short-grain japonica glutinous rice. The rice is pounded into paste and molded into the desired shape. In Japan it is traditionally made in a ceremony called mochitsuki. While also eaten year-round, mochi is a traditional food for the Japanese New Year and is commonly sold and eaten during that time.
Mochi is a multicomponent food consisting of polysaccharides, lipids, protein and water. Mochi has a heterogeneous structure of amylopectin gel, starch grains, and air bubbles. This rice is characterized by its lack of amylose in the starch and is derived from short or medium japonica rices. The protein concentration of the rice is higher than that of normal short-grain rice, and the two also differ in amylose content. In mochi rice, the amylose content is negligible, which results in its gel-like consistency.
- 1 History and origin
- 2 Seasonal specialities
- 3 Traditional preparation
- 4 Modern preparation
- 5 Processing
- 6 Preservation
- 7 Ingredients
- 8 Nutrition
- 9 Chemistry and structural composition of glutinous rice
- 10 Viscoelasticity
- 11 Health hazards
- 12 Popular uses
- 13 Other variations
- 14 Variations outside Japan
- 15 See also
- 16 External links
- 17 References
History and origin
The exact origin of mochi has yet to be confirmed. The first mochitsuki ceremony occurred after the Kami are said to have descended to Earth, which was following the birth of rice cultivation in Yamato during the Yayoi period (300 BC-300 AD). Red rice was the original variation used in the production of mochi. At this time, mochi was eaten exclusively by the Emperor and nobles due to its status as an omen of good fortune. During the Japanese Heian period (794-1192), mochi was used as a "food for the gods" and in religious offerings in Shinto rituals performed by aristocrats. In addition to good fortune, mochi was also known as a talisman for happy marriages.
The first recorded accounts of mochi being used as a part of New Year’s festivities are from the Japanese Heian period (794-1185). The nobles of the Imperial Court believed that long strands of freshly made mochi symbolized long life and well-being, while dried mochi helped strengthen one’s teeth. Accounts of mochi can also be found in the oldest Japanese novel, “The Tale of Genji.”
Mochi continues to be one of the traditional foods eaten around Japanese New Year, as it is sold and consumed in abundance around this time. A special type of mochi, called kagami mochi (mirror mochi), is placed on family altars on December 28 each year. Kagami mochi is composed of two spheres of mochi stacked on top of one another, topped with an orange (daidai). On this occasion, which was originally practiced by the samurai, the round rice cakes of kagami mochi would be broken and thus, symbolizing the mirror’s opening and the ending of the New Year’s celebrations.
- Kagami mochi is a New Year decoration, which is traditionally broken and eaten in a ritual called Kagami biraki (mirror opening).
- Zōni is a soup containing rice cakes. Zoni is also eaten on New Year's Day. In addition to mochi, zoni contains vegetables like taro, carrot, honeywort and red and white colored kamaboko.
- Kinako mochi is a mochi dish that is traditionally made on New Year's Day as an emblem of luck. This style of mochi preparation involves roasting the mochi over a fire or stove, then dipping it into water, finally coating it with sugar and kinako (soy flour).
The cherry blossom (sakura), is a symbol of Japan and signifies the onset of full-fledged Spring. Sakuramochi is a pink-coloured mochi surrounding sweet anko and wrapped in an edible, salted cherry leaf; this dish is usually made during the Spring season.
Children's Day is celebrated in Japan on May 5. On this day, the Japanese promote the happiness and well-being of children. Kashiwa-mochi and chimaki are made especially for this celebration.Kashiwa-mochi is white mochi surrounding a sweet anko filling with a Kashiwa oak leaf wrapped around it.
- Chimaki is a variation of a dango wrapped in bamboo leaves.
Hishi mochi is a ceremonial dessert that is presented as a ritual offering on the days leading up to Hinamatsuri or "Girls' Day" in Japan. Hishi mochi is rhomboid shaped mochi with layers of red, green, and white. The three layers of this mochi are coloured with jasmine flowers, water caltrop, and mugwort.
Traditionally, mochi was made from whole rice, in a labor-intensive process. The traditional mochi-pounding ceremony in Japan is mochitsuki:
- Polished glutinous rice is soaked overnight and steamed.
- The steamed rice is mashed and pounded with wooden mallets (kine) in a traditional mortar (usu). The work involves two people, one pounding and the other turning and wetting the substance  the mochi. They must keep a steady rhythm or they may accidentally injure each other with the heavy kine.
- The sticky mass can be eaten immediately or formed into various shapes (usually a sphere or cube).
Mochi is prepared from a flour of sweet rice (mochiko). The flour is mixed with water and cooked on a stovetop or in the microwave until it forms a sticky, opaque white mass. This process is performed twice, and the mass is stirred in between until it becomes malleable and slightly transparent.
With modern equipment, mochi can be made at home, with the technology automating the laborious dough pounding. Household mochi appliances provide a suitable space where the environment of the dough can be controlled.
The assembly-line sections in mochi production control the following aspect of mochi:
- Viscoelasticity or the products' chewiness by selecting specific species of rice
- Consistency of the dough during automated pounding process
- Flavourings and fillings
Varieties of glutinous and waxy rice are produced as major raw material for mochi. The rice is chosen for tensile strength and compressibility. One study found that in Kantomochi rice 172 and BC3, amylopectin distribution varied and affected the hardness of mochi. Kantomochi rice produced harder, brittle, grainy textures, all undesirable qualities except for ease of cutting. For mass production, the rice variety should be chewy but easy to separate.
There are generally two types of machines for mochi production in an assembly line. One machine prepares the dough while the other forms the dough into consistent shapes, unfilled or with filling. The first type of machine controls the temperature at which the rice gelatinizes. One study found that a temperature of 62 °C corresponds to the gelatinization of mochi. When the temperature fell below 62 °C the hardening was too slow. It was concluded that a processing temperature below 62 °C was unsuitable for dough preparation.
Mochi is a variation of a low-calorie, low-fat rice cake. The cake has two essential raw materials, rice and water. Sticky rice (also called sweet rice, Oryza Sativa Var/Oryza Glutinosa, Glutinous sticky rice, Glutinous rice, Waxy rice, Botan rice, Biroin Chal, Mochi rice, Pearl rice, and Pulut), whether brown or white, is best for mochi making, as long-grain varieties will not expand perfectly. Water is essential in the early stages of preparation. Other additives such as salt and other seasonings and flavourings are important in terms of nutritive value and taste. However, additives can cause breakage of the mass and for this reason, should not be added to the rice before the cake is formed. The cake must be steamed (rather than boiled) until it gains a smooth and elastic texture. The balls of rice are then flattened, cut into pieces, or shaped into rounds. The machines for mass production are a hugely expensive investment, and the product (the mochi) should have the proper moisture, to appeal to consumers.
- The first step is to sprout the rice, which can be done using the soaking method or the humidity method. The soaking method involves soaking rice in water until the desired moisture level is attained (for example 10 kilograms of rice is soaked for 6–12 hours). The final soaked rice volume should be 50% greater than the dried rice. In the humidity method, the rice is circulated in a device similar to a grain dryer. The device blows warm and moist air onto the rice.
- After sprouting, the rice should be dried. For this step, a mechanical dryer or heated environment is essential. Usually, a temperature of 38 °–82 °C is used. Drying time depends on different factors such as rice quantity, chemical composition and the temperature of the environment.
- The next step is roasting. The soaked and dried rice is roasted with an oven or a mechanical roaster. The rice is then transferred on long trays approximately 1.3 cm deep to a 90°–200 °C environment for 30–60 minutes or until the rice become light brown.
- After being roasted, the rice is placed in an environment below 27 °C to cool.
- The cooled rice is then ground by a roller mill, burr mill, attrition mill, disintegrator mill or hammer mill.
- The rice flour is then placed in the rice cake machine. Each manufacturer has approximately 80-90 machines, and each machine has 1-3 cooking heads which make one mochi cake every 15 seconds.
- The rice flour should be soaked to a liquid. Different kinds of mochi are soaked in different types of liquids such as water, milk, broth, juice, gravy, or plant milk (such as soy and almond).
- The soaked rice flour is then placed into the hoppers which are located above the machines.
- The soaked rice flour is removed from hoppers to the iron molds or cooking head in the machines by gravity force. The molds are then heated to hundreds of degrees.
- While the molds are heated to hundreds of degrees, the plates are opened and the molds exposed to a vacuum (a combination of heat and pressure).
- After 8–10 seconds, the lids of the molds expand so that the pressure increases. At the end of the process of the combination of pressure and temperature, the cake has completely expanded into the molds.
- Once the desired expansion of molds is acquired, the iron molds/cooking heads open, allowing the rice cakes to fall softly onto the conveyor belt.
- The belt carries the cakes around spraying heads, where different flavours and additives are sprayed onto them. The flavours will depend on the different types of mochi. However, natural flavours are usually preferred (salt, strawberry, mango, blueberry, apple cinnamon, caramel, almond, salsa, nacho, taco, and tamari seaweed).
- After the addition of different flavours, the cakes will be carried to the dryer tunnel by the belt. In the dryer tunnel the moisture of the rice cakes will vanish.
- At the last stage, the belt moves the finished mochi to the bagging area. In the bagging area, the cakes are inspected carefully for any breakage or damage, then stacked, packaged, sealed, and labelled.
The best preservation for mochi is refrigeration for a short storage period. For preserving larger batches of mochi over an extended period of time, freezing is recommended. The best method for freezing involves pre-wrapping each mochi cake tightly in a sealed plastic bag. Although mochi can be kept in a freezer for almost one year, the frozen mochi may lose flavor and softness or get freezer-burned.
Mochi is relatively simple to make as there are only a handful of ingredients for plain, natural mochi. The main ingredient is either Shiratamako or Mochiko, Japanese sweet glutinous rice flours. Both Shiratamako and Mochiko are made from Mochigome, a type of Japanese glutinous short grain rice. The difference between Shiratamako and Mochiko comes from texture and processing methods. Shiratamako flour has been more refined and is a finer flour with a smoother, more elastic feel. Mochiko is less refined and has a doughier texture.
Other ingredients may include water, sugar and cornstarch to prevent sticking. Other ingredients can be added to create different variations of mochi.
The calorie density of a matchbox-sized piece of mochi is comparable to that of a bowl of rice. Japanese farmers were known to consume mochi during the winter in order to increase their stamina while the Japanese samurai took mochi on their expeditions as it was easy to carry and prepare. Mochi is gluten and cholesterol free as it is made from rice flour.
A single serving of 44.0 grams has 96 calories, 1.0 gram of fat, but no trans or saturated fat, 1.0 milligram of sodium, 22.0 grams of carbohydrates, 0 grams of dietary fiber, 6.0 grams of sugar and 1.0 gram of protein.
Nutritionally, mochi is composed primarily of carbohydrates, most of which take the form of starch.
Chemistry and structural composition of glutinous rice
Amylose and amylopectin are both components of starch and polysaccharides made from D-glucose units. The big difference between the two is that amylose is linear because it only has αlpha-1,4-glycosidic bonds. Amylopectin on the other hand, is a branched polysaccharide because it has αlpha-1,4-glycosidic bonds with occasional αlpha-1,6-glycosidic bonds approximately every 22 D-glucose units. Glutinous rice is nearly 100% composed of amylopectin (one of the two components that makes up starch) and almost completely lacks its counterpart, amylose, in its starch granules. A non-glutinous rice grain contains amylose at about 10-30% weight by weight and amylopectin at about 70-90% weight by weight.
Glutinous or waxy type of starches occur in maize, sorghum, wheat, and rice. An interesting characteristic of glutinous rice is that it stains red when iodine is added whereas non-glutinous rice stains blue. This phenomenon occurs when iodine is mixed with iodide to form tri-iodide and penta-iodide. Penta-iodide intercalates between the starch molecules and stains amylose and amylopectin blue and red respectively. The gelation and viscous texture of glutinous rice is due to amylopectin being more hygroscopic than amylose, so it has a higher affinity for water. Thus, water enters the starch granule causing it to swell, while the amylose leaves the starch granule and becomes part of a colloidal solution. In other words, the higher the amylopectin content, the higher the swelling of the starch granule.
Even though the amylopectin content plays a major role in the defined characteristic of viscosity in glutinous rice, factors such as heat also play a very important role in the swelling since it enhances the uptake of water into the starch granule significantly. It is estimated that the swelling increases at about 10% in volume per 10 °C temperature increase.
The high amylopectin content of waxy or glutinous starches is genetically controlled by the waxy or wax gene. Its quality of greater viscosity and gelation is dependent on the distribution of the amylopectin unit chains. Grains that have this gene are considered mutants, which explains why most of them are selectively bred to create a grain that is close to having or has a 0% amylose content. The table below summarizes the amylose and amylopectin content of different starches, waxy and non-waxy:
|Starch||Amylose %||Amylopectin %|
|Rice (long grain)||22||78|
The soaking of the glutinous rice is an elemental step in the preparation of mochi, either traditionally or industrially. During this process, glutinous rice decreases in protein content as it is soaked in water. The chemicals that make up the flavour of plain or "natural" mochi are ethyl ester acetic acid, ethanol, 2-butanol, 2 methyl 1-propanol, 1-butanol, 3-methyl 1 butanol, 1-pentanol and propane acid.
Mochi is usually composed solely of glutinous rice, however, some variations may include the additions of salt, spices and flavourings such as cinnamon (cinnamaldehyde). Food additives such as sucrose, sorbitol or glycerol may be added to increase viscosity and therefore increase gelatinization. Additives that slow down retrogradation are not usually added since amylopectin has a very stable shelf life due to its high amylopectin content.
Mochi's characteristic chewiness is due to the polysaccharides in it. The viscosity and elasticity that account for this chewiness are affected by many factors such as the starch concentration, configuration of the swollen starch granules, the conditions of heating (temperature, heating period and rate of heating) as well as the junction zones that interconnect each polymer chain. The more junction zones the substance has, the stronger the cohesiveness of the gel, thereby forming a more solid like material. The perfect mochi has the perfect balance between viscosity and elasticity so that it is not inextensible and fragile but rather extensible yet firm.
Many tests have been conducted on the factors that affect the viscoelastic properties of mochi. As puncture tests show, samples with a higher solid (polysaccharide) content show an increased resistance and thereby a stronger and tougher gel. This increased resistance to the puncture test indicate that an increase in solute concentration leads to a more rigid and harder gel with an increased cohesiveness, internal binding, elasticity and springiness which means a decrease in material flow or an increase in viscosity. These results can also be brought about by an increase in heating time.
Sensory assessments of the hardness, stickiness and elasticity of mochi and their relationship with solute concentration and heating time were performed. Similar to the puncture test results, sensory tests determine that hardness and elasticity increase with increasing time of heating and solid concentration. However, stickiness of the samples increase with increasing time of heating and solid concentration until a certain level, above which the reverse is observed.
These relationships are important because too hard or elastic a mochi is undesirable, as is one that is too sticky and will stick to walls of the container.
Suffocation deaths are caused by mochi every year in Japan, especially among elderly people. According to the Tokyo Fire Department which responds to choking cases, mochi sends more than 100 people to the hospital every year in Tokyo alone. Between 2006 and 2009, 18 people died from choking on mochi in the Japanese capital, according to city's fire department. In 2011, Japanese media reported eight mochi-related deaths in Tokyo in January.
Every year, Japanese authorities warn people to cut mochi into small pieces before eating it. The Tokyo Fire Department even has a website offering tips on how to help someone choking on mochi.
Though mochi is often consumed alone as a major component of a main meal, it is often used as an ingredient in many other prepared foods.
Many types of traditional wagashi and mochigashi (Japanese traditional sweets) are made with mochi. For example, daifuku is a soft round mochi stuffed with sweet filling, such as sweetened red bean paste (anko) or white bean paste (shiro an). Ichigo daifuku is a version containing a whole strawberry inside.
- Oshiruko or ozenzai is a sweet azuki bean soup with pieces of mochi. In winter, Japanese people often eat it to warm themselves.
- Chikara udon (meaning "power udon") is a dish consisting of udon noodles in soup topped with toasted mochi.
- Zōni. See New Year specialties below.
- Dango is a Japanese dumpling made from mochiko (rice flour).
- Warabimochi is not true mochi, but a jelly-like confection made from bracken starch and covered or dipped in kinako (soybean flour) with sugar. It is popular in the summertime, and often sold from trucks, not unlike ice cream trucks in Western countries.
- Manjū (饅頭、まんじゅう)is not a true mochi, but a popular traditional Japanese confection. Made of flour, rice powder, buckwheat, and red bean paste.
- Yōkan (羊羮) is a thick,jelly-like dessert. It is made of red bean paste, agar, and sugar. There are two main types: Neri yōkan and mizu yōkan.
- More recently, "Moffles" (a waffle made from a toasted mochi) has been introduced. It is made in a specialized machine as well as a traditional waffle iron.
Variations outside Japan
In Taiwan, a traditional Hakka and Hoklo pounded rice cake was called tauchi (Chinese: 豆糍; Pe̍h-ōe-jī: tāu-chî) and came in various styles and forms just like in Japan. Traditional Hakka tauchi is served as glutinous rice dough, covered with peanut or sesame powder. Not until the Japanese era was Japanese-style mochi introduced and gain popularity. Nowadays, Taiwanese mochi often came with bean paste fillings.
In China, tangyuan is made from glutinous rice flour mixed with a small amount of water to form balls and is then cooked and served in boiling water. Tangyuan is typically filled with black sesame paste or peanut paste and served in the water that it was boiled in.
In Hong Kong and other Cantonese regions, the traditional Lo Mai Chi (Chinese: 糯米糍 no6 mai5 ci4) is made of glutinous rice flour in the shape of a ball, with fillings such as crushed peanuts, coconut, red bean paste, and black sesame paste. It can come in a variety of modern flavors such as green tea, mango, taro, strawberry, and more.
In Philippines, a traditional Filipino sweet snack similar to Japanese mochi is called tikoy (Chinese: 甜粿; Pe̍h-ōe-jī: tiⁿ-kóe). There is also another delicacy called espasol with a taste similar to Japanese kinako mochi, though made with roasted rice flour (not kinako, roasted soy flour).
In Hawaii, a dessert variety called "butter mochi" is made with butter, sugar, coconut, and other ingredients then baked to make a sponge cake of sorts.
Similar foods in other countries:
- Chapssal-tteok, Korean glutinous rice cakes
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